read code via server issue

when i try read codes via server on g950f and g955f
it ask to download modem even when modem is low

after downloading modem it still fail

You have 45 credit(s) left. This operation takes 5 credits.Continue? Yes
Searching Samsung modem... detected COM162
Reading phone info...
Model: SM-G955F
AP version: G955FXXU1CRB7
CSC version: G955FEVR1CRB1
CP version: G955FXXU1AQG1
Product code: EVR
Phone SN: R58J34Q7WMR
IMEI: 35435808xxxxxxx
Unique number: CE03171348DA50730C
Searching Samsung diag port... detected COM164
Reading phone info... OK
CP version: G955FXXU1AQG1
CP build: Jul 6 2017 19:49:05
Reading data from phone... error (1)
Searching server... OK
Checking available files... OK
Downloading file... OK
Checking local file... OK
Switching to flash mode... OK
Searching USB Flash interface... COM73 detected
Setup connection... OK
Reading data from phone... OK
Sending data to phone... OK
Searching Samsung modem... detected COM162
Reading phone info...
Model: SM-G955F
AP version: G955FXXU1CRB7
CSC version: G955FEVR1CRB1
CP version: G955FXXU1AQL5
Product code: EVR
Phone SN: R58J34Q7WMR
IMEI: 35435808xxxxxxx
Unique number: CE03171348DA50730C
Searching Samsung diag port... detected COM164
Reading phone info... OK
CP version: G955FXXU1AQL5
CP build: Dec 12 2017 21:01:55
Reading data from phone... error (1)
Try downgrade modem if possible
Done with Samsung Tool PRO v.31.2